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在正交频分复用 (OFDM)无线通信系统中 ,系统的吞吐量和数据速率受到导频因素的制约 ,这种情况在高速移动环境下尤为明显 .本文提出了一种改进的迭代联合信道估计与符号检测算法 ,以提高系统的吞吐量和数据速率 .首先降低导频功率来提高系统的吞吐量 ,然后在一个OFDM符号内 ,通过迭代进行的信道估计与符号检测来提高系统的误码率 .每个OFDM符号的初始信道估计值取自上一个OFDM符号的信道估计 ,从而该算法能有效地跟踪衰落信道的变化 ,因此导频的数目可以大大降低 .仿真结果显示 ,与传统的迭代算法相比 ,本文提出的算法能提供更好的误码性能 .
In Orthogonal Frequency Division Multiplexing (OFDM) wireless communication system, throughput and data rate of the system are restricted by pilot factors, especially in high-speed mobile environment.In this paper, an improved iterative combined channel Estimation and symbol detection algorithm to improve system throughput and data rate.First reduce the pilot power to improve the system throughput, and then in an OFDM symbol, through iterative channel estimation and symbol detection to improve the system error Rate.The initial channel estimate of each OFDM symbol is taken from the channel estimation of the last OFDM symbol so that the algorithm can effectively track the change of fading channel and therefore the number of pilots can be greatly reduced.The simulation results show that compared with the traditional iteration Compared with the algorithm, the proposed algorithm can provide better error performance.